The document describes three models of urban land use: Burgess's 1924 model of Chicago which had 5 socioeconomic zones radiating from the city center; Hoyt's 1939 sector model based on 142 US cities which arranged zones in wedge-shaped sectors along transport lines; and the functional zone model which arranges zones from the CBD to outer suburbs based on housing type and infrastructure. The models attempt to explain typical land use patterns in cities but have limitations as they do not account for variations between individual cities.